A special processing fixture for trailer hook nut

Abstract

The utility model relates to related technical field of mechanical engineering especially, a kind of processing fixture special for trailer hook nut, including support and protective sleeve, the side surface of support away from protective sleeve is fixedly connected with table board, the side surface of table board away from protective sleeve is fixedly connected with fixed plate, recess is set up in the side surface of fixed plate away from protective sleeve, the side surface of fixed plate is fixedly connected with connecting plate.This processing fixture special for trailer hook nut, when facing different size nut, only need to adjust the length of electric cylinder, the spacing of two clamping blocks can be changed, the clamping demand of different specifications nut can be satisfied, in addition, multiple uniform arrangement convex strip not only can promote friction force, but also can be adapted to the slight size deviation of workpiece surface by its slight deformation, further expand the adaptation range of different specifications trailer hook nut, greatly reduce the time and cost of frequently switching tooling due to workpiece specification replacement.

Description

Technical Field

[0001] This utility model relates to the field of mechanical engineering technology, and in particular to a special processing fixture for trailer hook nuts. Background Technology

[0002] Trailer hook nuts are key fastening components in automotive chassis systems. Their core function is to stably fix the trailer hook to the vehicle body or frame, ensuring the transmission of traction and bearing of loads during towing and rescue operations. They are mostly made of high-strength materials such as 45# steel and 40Cr, and undergo tempering and quenching treatments. They have high internal thread precision, and the outer contour is mostly hexagonal or has positioning steps. Dimensional tolerances and thread precision must be strictly controlled. Some surfaces are treated with galvanizing, Dacromet coating, or other anti-rust treatments. They are mainly used in passenger cars and commercial vehicles with towing capabilities, and are installed on the frame longitudinal beams inside the front and rear bumpers of the vehicle. Together with the body mounting holes and trailer hooks, they form a stable connection assembly. As a component related to automotive safety, a special machining fixture for trailer hook nuts is particularly needed.

[0003] However, existing trailer hook nut processing fixtures have a limited clamping range and are difficult to adjust flexibly according to the size and shape differences of different specifications of trailer hook nuts. Usually, fixtures need to be customized for different models of products, which increases production input and inventory costs. Frequent fixture changes will also prolong operation changeover time and reduce processing efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a special machining fixture for trailer hook nuts to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a special processing fixture for trailer hook nuts, comprising a bracket and a protective sleeve, wherein a table is fixedly connected to the side surface of the bracket away from the protective sleeve, a fixing plate is fixedly connected to the side surface of the table away from the protective sleeve, a groove is formed on the side surface of the fixing plate away from the protective sleeve, a connecting plate is fixedly connected to one side surface of the fixing plate, a guide rail is fixedly connected to the side surface of the connecting plate away from the protective sleeve, and a clamping mechanism is provided on the side surface of the table away from the bracket; The clamping mechanism includes an electric cylinder, which is fixedly connected to the surface of the table away from the support. A movable component is fixedly connected to the output end of the electric cylinder. A cylinder is fixedly connected to the inner surface of the movable component. A connecting rod is slidably connected to the outer surface of the cylinder. A movable hole is opened on one side surface of the connecting rod. A connecting block is fixedly connected to one end of the connecting rod. A sliding groove is opened on one side surface of the connecting block. A fixing plate is fixedly connected to the surface of the connecting block away from the connecting rod. A clamping block is fixedly connected to one side surface of the fixing plate. A protrusion is fixedly connected to one side surface of the clamping block.

[0006] Preferably, the connecting rod, connecting block, fixing plate and clamping block are provided in two of the same size and are symmetrically distributed along the horizontal central axis of the guide rail, and the cylinder is adapted to the size of the movable hole.

[0007] Preferably, the outer wall dimensions of the guide rail are adapted to the inner wall dimensions of the sliding groove, and the fixing plate and the connecting plate are arranged in a "T" shape.

[0008] Preferably, the cross-section of the movable component is U-shaped, and the end of the movable component near the tabletop is adapted to the size of the groove.

[0009] Preferably, the vertical central axis of the cylinder intersects perpendicularly with the horizontal central axis of the moving member, and the cross-section of the clamping block is "". Shape design.

[0010] Preferably, the protective sleeve has four of the same size and is symmetrically distributed along the horizontal central axis of the bracket, and the horizontal central axes of the electric cylinder, the moving part and the fixed plate coincide.

[0011] Preferably, the convex strips are provided with multiple strips of the same size, and the fixing pieces and connecting blocks are distributed parallel to the horizontal central axis of the clamping block.

[0012] Compared with the prior art, the beneficial effects of this utility model are: when faced with nuts of different sizes, the special processing fixture for trailer hook nuts can change the distance between the two clamping blocks by simply adjusting the length of the electric cylinder extension, which can meet the clamping requirements of nuts of different specifications. In addition, the multiple evenly arranged convex strips can not only improve the friction, but also adapt to the slight dimensional deviations of the workpiece surface through their own slight deformation, further expanding the adaptability range of trailer hook nuts of different specifications, and greatly reducing the time and cost of frequently changing tooling due to changes in workpiece specifications. The concave cross-section design of the moving part not only ensures the stability of the movement, but also makes it easy for operators to observe the engagement status of the internal cylinder and connecting rod, and facilitates the timely detection of problems such as jamming and wear. The four protective sleeves symmetrically distributed along the bracket not only provide support, but also absorb machining vibrations when the fixture is working, reducing the impact of vibrations on precision components such as electric cylinders and guide rails, and indirectly improving clamping accuracy. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the tabletop, fixing plate, groove, and connecting plate of this utility model; Figure 3 This is a schematic diagram of the electric cylinder, moving part, and cylindrical structure of this utility model; Figure 4 This is a schematic diagram of the guide rail, connecting rod, and movable hole structure of this utility model; Figure 5 This is a schematic diagram of the fixing plate, clamping block and protrusion structure of this utility model; Figure 6 This is a schematic diagram of the connecting block and sliding groove structure of this utility model.

[0014] In the diagram: 1. Bracket; 2. Protective cover; 3. Tabletop; 4. Fixing plate; 5. Groove; 6. Connecting plate; 7. Guide rail; 8. Clamping mechanism; 801. Electric cylinder; 802. Moving part; 803. Cylinder; 804. Connecting rod; 805. Movable hole; 806. Connecting block; 807. Sliding groove; 808. Fixing plate; 809. Clamping block; 810. Protrusion. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-6 This utility model provides a technical solution: a special processing fixture for trailer hook nuts, including a bracket 1 and a protective sleeve 2. A table 3 is fixedly connected to the side surface of the bracket 1 away from the protective sleeve 2. A fixing plate 4 is fixedly connected to the side surface of the table 3 away from the protective sleeve 2. A groove 5 is opened on the side surface of the fixing plate 4 away from the protective sleeve 2. A connecting plate 6 is fixedly connected to one side surface of the fixing plate 4. A guide rail 7 is fixedly connected to the side surface of the connecting plate 6 away from the protective sleeve 2. A clamping mechanism 8 is provided on the side surface of the table 3 away from the bracket 1. The clamping mechanism 8 includes an electric cylinder 801, which is fixedly connected to the surface of the table 3 away from the support 1. A movable component 802 is fixedly connected to the output end of the electric cylinder 801. A cylinder 803 is fixedly connected to the inner surface of the movable component 802. A connecting rod 804 is slidably connected to the outer surface of the cylinder 803. A movable hole 805 is formed on one side surface of the connecting rod 804. A connecting block 806 is fixedly connected to one end of the connecting rod 804. A sliding groove 807 is formed on one side surface of the connecting block 806. A fixing plate 808 is fixedly connected to the side surface of the connecting block 806 away from the connecting rod 804. A clamping device is fixedly connected to one side surface of the fixing plate 808. Block 809, with a protrusion 810 fixedly connected to one side surface of clamping block 809. Through the arrangement of electric cylinder 801, moving part 802, cylinder 803, connecting rod 804, movable hole 805, connecting block 806, sliding groove 807, fixing plate 808, clamping block 809, and protrusion 810, in use, activating electric cylinder 801 pushes the fixedly connected moving part 802 to move horizontally. Since the horizontal and vertical central axes of electric cylinder 801, moving part 802, and fixing plate 4 coincide, there is no offset during power transmission. The end of moving part 802 near the table 3 can be precisely embedded in the groove 5 and slide stably along the trajectory of the groove 5. To prevent the movable part 802 from wobbling or shifting during movement, the cylinder 803 fixed on its inner surface moves synchronously with the movable part 802 during movement. Since the outer side of the cylinder 803 is slidably connected to the movable hole 805 of the connecting rod 804, and the vertical central axis of the cylinder 803 intersects perpendicularly with the horizontal central axis of the movable part 802, the cylinder 803 generates a lateral thrust on the inner wall of the movable hole 805 during movement. This forces the two connecting rods 804 to move with the movable hole 805 as the force. At this time, the end of the connecting rod 804 away from the cylinder 803 is fixedly connected to the connecting block 806, and the connecting block 806 is connected via the sliding groove 803. 07 slides with guide rail 7, and the movement of connecting rod 804 is restricted within the guiding range of guide rail 7. Driven by connecting rod 804, two connecting blocks 806 move synchronously along the horizontal central axis of guide rail 7 towards the center of guide rail 7. As connecting block 806 moves towards the center, fixing plate 808 and clamping block 809, which are fixed to the side of connecting block 806 away from connecting rod 804, move synchronously towards trailer hook nut. Multiple protrusions 810 on the surface of clamping block 809 greatly increase the friction of clamping surface, which can further expand the adaptability range of trailer hook nuts of different specifications, and greatly reduce the time and cost of frequently changing tooling due to workpiece specification changes.

[0017] Furthermore, two of the connecting rod 804, connecting block 806, fixing plate 808, and clamping block 809 are provided with the same size and are symmetrically distributed along the horizontal central axis of the guide rail 7. The cylinder 803 is adapted to the size of the movable hole 805. Through the arrangement of the cylinder 803 and the movable hole 805, when in use, the cylinder 803 can apply a thrust to the inner wall of the movable hole 805 when it moves. The size-adaptive design ensures the stability of the thrust.

[0018] Furthermore, the outer wall dimensions of the guide rail 7 are adapted to the inner wall dimensions of the sliding groove 807. The fixing plate 4 and the connecting plate 6 are arranged in a "T" shape. Through the setting of the guide rail 7 and the sliding groove 807, the inner wall of the sliding groove 807 can always maintain close contact with the outer wall of the guide rail 7 during use, providing precise guidance for the movement of the connecting block 806, avoiding lateral deviation or up-and-down wobbling of the connecting block 806 when it moves with the connecting rod 804, and ensuring that the connecting block 806 can only move linearly along the horizontal direction of the guide rail 7.

[0019] Furthermore, the cross-section of the movable component 802 is designed in the shape of a "U". The end of the movable component 802 near the table 3 is adapted to the size of the groove 5. Through the arrangement of the movable component 802 and the groove 5, when the movable component 802 slides in the groove 5 during use, the inner wall of the groove 5 will generate a limiting support force on the movable component 802, which will offset part of the radial force generated by the reaction force of the connecting rod 804, making the mechanism more stable.

[0020] Furthermore, the vertical central axis of the cylinder 803 intersects perpendicularly with the horizontal central axis of the moving part 802, and the cross-section of the clamping block 809 is " The "shape" design, through the arrangement of cylinder 803 and moving part 802, allows the cylinder 803 to accurately convert the linear power of moving part 802 into lateral thrust on connecting rod 804 when moving part 802 moves in the horizontal direction, making the mechanism more stable.

[0021] Furthermore, the protective sleeve 2 has four of the same size, which are symmetrically distributed along the horizontal central axis of the bracket 1. The horizontal central axes of the electric cylinder 801, the moving part 802 and the fixed plate 4 coincide. With the setting of the protective sleeve 2, in use, the four protective sleeves 2 symmetrically distributed along the bracket 1 can not only provide support, but also absorb processing vibrations when the fixture is working, reduce the impact of vibrations on precision components such as the electric cylinder 801 and the guide rail 7, and indirectly improve the clamping accuracy.

[0022] Furthermore, multiple convex strips 810 of the same size are provided. The fixing plate 808 and the connecting block 806 are distributed parallel to the horizontal central axis of the clamping block 809. With the setting of convex strips 810, multiple evenly distributed convex strips 810 can greatly increase the friction coefficient between the clamping block 809 and the workpiece surface during use, making the processing process more stable.

[0023] Working principle: When it is necessary to clamp the trailer hook nut, the electric cylinder 801 is activated, causing the output end to extend away from itself, pushing the fixedly connected moving part 802 to move horizontally. Since the horizontal and vertical central axes of the electric cylinder 801, the moving part 802, and the fixed plate 4 coincide, there is no offset during power transmission. The end of the moving part 802 near the table 3 can be precisely embedded in the groove 5 and slide stably along the trajectory of the groove 5, avoiding shaking or offset of the moving part 802 during movement. When the moving part 802 moves, its inner surface is fixed. The fixed cylinder 803 moves synchronously with the moving part 802. Since the outer side of the cylinder 803 is slidably connected to the movable hole 805 of the connecting rod 804, and the vertical central axis of the cylinder 803 intersects the horizontal central axis of the moving part 802 perpendicularly, the cylinder 803 will generate a lateral thrust on the inner wall of the movable hole 805 during the movement, forcing the two connecting rods 804 to move with the movable hole 805 as the force. At this time, the end of the connecting rod 804 away from the cylinder 803 is fixedly connected to the connecting block 806, and the connecting block 806 slides through the sliding groove 807 and the guide rail 7. In a dynamic coordination, the movement of the connecting rod 804 is restricted within the guiding range of the guide rail 7. Driven by the connecting rod 804, the two connecting blocks 806 move synchronously along the transverse central axis of the guide rail 7 towards the center of the guide rail 7. As the connecting blocks 806 move towards the center, the clamping block 809, which is fixed on the side of the connecting block 806 away from the connecting rod 804, moves synchronously towards the trailer hook nut. Multiple identical sized protrusions 810 on one side surface of the clamping block 809 make close contact with the workpiece surface. The design of the protrusions 810 significantly improves the friction of the clamping surface, effectively preventing the workpiece from slipping. If slippage or rotation occurs during subsequent processing, after the processing of the trailer hook nut is completed, the electric cylinder 801 is restarted to control its output end to retract, driving the moving part 802 to reset towards the electric cylinder 801. When the moving part 802 resets, the cylinder 803 moves in the opposite direction, generating a reverse pulling force on the movable hole 805 of the connecting rod 804, causing the connecting rod 804 to drive the connecting block 806 to move along the guide rail 7 away from the center. The clamping block 809 then separates from the workpiece, thus completing the use of a special processing fixture for trailer hook nuts.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A special machining fixture for trailer hook nuts, comprising a bracket (1) and a protective sleeve (2), characterized in that: A tabletop (3) is fixedly connected to the side surface of the bracket (1) away from the protective sleeve (2). A fixing plate (4) is fixedly connected to the side surface of the tabletop (3) away from the protective sleeve (2). A groove (5) is provided on the side surface of the fixing plate (4) away from the protective sleeve (2). A connecting plate (6) is fixedly connected to the side surface of the fixing plate (4). A guide rail (7) is fixedly connected to the side surface of the connecting plate (6) away from the protective sleeve (2). A clamping mechanism (8) is provided on the side surface of the tabletop (3) away from the bracket (1). The clamping mechanism (8) includes an electric cylinder (801), which is fixedly connected to the side surface of the table (3) away from the support (1). The output end of the electric cylinder (801) is fixedly connected to a moving part (802). A cylinder (803) is fixedly connected to the inner surface of the moving part (802). A connecting rod (804) is slidably connected to the outer side of the cylinder (803). A movable hole (805) is opened on one side surface of the connecting rod (804). A connecting block (806) is fixedly connected to one end of the connecting rod (804). A sliding groove (807) is opened on one side surface of the connecting block (806). A fixing plate (808) is fixedly connected to the side surface of the connecting block (806) away from the connecting rod (804). A clamping block (809) is fixedly connected to one side surface of the fixing plate (808). A protrusion (810) is fixedly connected to one side surface of the clamping block (809).

2. The special machining fixture for trailer hook nuts according to claim 1, characterized in that: The connecting rod (804), connecting block (806), fixing plate (808) and clamping block (809) are provided in two of the same size and are symmetrically distributed along the horizontal central axis of the guide rail (7). The cylinder (803) is adapted to the size of the movable hole (805).

3. The special machining fixture for trailer hook nuts according to claim 1, characterized in that: The outer wall dimensions of the guide rail (7) are adapted to the inner wall dimensions of the sliding groove (807), and the fixing plate (4) and the connecting plate (6) are arranged in a "T" shape.

4. A special machining fixture for trailer hook nuts according to claim 1, characterized in that: The cross-section of the movable part (802) is U-shaped, and the end of the movable part (802) near the table (3) is adapted to the size of the groove (5).

5. A special machining fixture for trailer hook nuts according to claim 1, characterized in that: The vertical central axis of the cylinder (803) intersects perpendicularly with the horizontal central axis of the moving part (802), and the cross-section of the clamping block (809) is " Shape design.

6. A special machining fixture for trailer hook nuts according to claim 1, characterized in that: The protective sleeve (2) has four of the same size and is symmetrically distributed along the horizontal central axis of the bracket (1). The horizontal central axes of the electric cylinder (801), the moving part (802) and the fixed plate (4) coincide.

7. A special machining fixture for trailer hook nuts according to claim 1, characterized in that: The protrusions (810) are provided with multiple of the same size, and the fixing pieces (808) and connecting blocks (806) are distributed parallel to the horizontal central axis of the clamping block (809).

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